Christian life is a warfare

Ephesians 6:11
Take up God’s instruments of war, so that you may be able to keep your position against all the deceits of the Evil One.

Ephesians 6:12
For our fight is not against flesh and blood, but against authorities and powers, against the world-rulers of this dark night, against the spirits of evil in the heavens.

1)Eph 6:13 For this reason take up all the arms of God, so that you may be able to be strong in the evil day, and, having done all, to keep your place.
Eph 6:14 Take your place, then, having your body clothed with the true word, and having put on the breastplate of righteousness;
Eph 6:15 Be ready with the good news of peace as shoes on your feet;
Eph 6:16 And most of all, using faith as a cover to keep off all the flaming arrows of the Evil One.
Eph 6:17 And take salvation for your head-dress and the sword of the Spirit, which is the word of God:
Eph 6:18 With prayers and deep desires, making requests at all times in the Spirit, and keeping watch, with strong purpose, in prayer for all the saints,
Eph 6:19 And for me, that words may be given to me in the opening of my mouth, to make clear without fear the secret of the good news,
Eph 6:20 For which I am a representative in chains, and that I may say without fear the things which it is right for me to say.

References
1Eph 6:13 For this reason take up all the arms of God, so that you may be able to be strong in the evil day, and, having done all, to keep your place.
Eph 6:14 Take your place, then, having your body clothed with the true word, and having put on the breastplate of righteousness;
Eph 6:15 Be ready with the good news of peace as shoes on your feet;
Eph 6:16 And most of all, using faith as a cover to keep off all the flaming arrows of the Evil One.
Eph 6:17 And take salvation for your head-dress and the sword of the Spirit, which is the word of God:
Eph 6:18 With prayers and deep desires, making requests at all times in the Spirit, and keeping watch, with strong purpose, in prayer for all the saints,
Eph 6:19 And for me, that words may be given to me in the opening of my mouth, to make clear without fear the secret of the good news,
Eph 6:20 For which I am a representative in chains, and that I may say without fear the things which it is right for me to say.

Do not walk in the way of the world

Ephesians 4:17
This I say, then, and give witness in the Lord, that you are to go no longer in the way of the Gentiles whose minds are turned to that which has no profit,

Ephesians 4:18
Whose thoughts are dark, to whom the life of God is strange because they are without knowledge, and their hearts have been made hard;

Ephesians 4:19
Who having no more power of feeling, have given themselves up to evil passions, to do all unclean things with overmuch desire.